Mercedes Benz fan keeps running sounds like an airplane - how to diagnose

06-07 Mercedes-Benz have faulty ecm’s. The other reason a fan will run is lack or communication through the CAN data bus.
06-07 E C CLK ML GL R SL have bad ECM’s!!
Hello fellow Mercedes-Benz friends. In this video I show you how diagnosis can lie to you and confuse you and how to always VERIFY the fault before repairing anything or buying parts.
I deal with this issue all the time and 99% of the time the engine modules are faulty. But it is no fun to make a video telling you that. So instead I showed how the diagnosis should have went down. Now what I did on my own meathead time was try and save the customer some money by swapping EEPROMS. I am NOT an electrical engineer , I am NOT good with small circuit board repairs and you will see haha.
I was lucky enough to swap the EEPROM from the customers ECM to a used ECM and then to another used ECM and back to the original ECM and it still worked!!!!
In the end it was more cost effective to find a used ecm, send both out to a mobile mechanic with the software to swap Drive Authorization Data and VINs in the modules and plug and play.
I did try Mercedesecm.com and they jacked me around for 1 month. Luckily they refunded the 800 they charged me for a "reconditioned"ecm that never came or was sent.
if you would kindly donate to my channel
www.Paypal.me/Benztech
please leave a like, hit subscribe.
More videos to come!
Lou

[@danieldenton]

Thanks for featuring our Benz! Thanks for all your help Lou. For all you viewers and possible customers: Lou is a great mechanic. He is relentless in finding answers in auto issues. He treated us respectfully and was upfront, staying in touch and explaining things. I recommend Lou very much. Thanks, Dan

[@user-qj2ec3uq3p]

Where are you located?

[@RothBeyondTheGrave]

Funny, I'm a professional musician working on my c207 & my sister's w203 & its always awesome seeing professional mechanics, etc playing their own music in their vids! Also, never knew about early m272's having bad ECM's. That's slightly terrifying hahaha....I just had a 0521 paired w/ a hard cold start & same fan nonsense. Coolant temp sensor read a fault also & had one on hand so fingers crossed. My bank1 tumble flap sensor is undercurrent, so also praying I can just swap that before I check the front of the dreaded intake manifold for you know what. Thanks for what you do!

[@lisasorrentino3871]

I am having the same issue with my car. It started a year ago. At that time, I disconnected the battery and took to a shop. No issues until yesterday. I dis connected the battery overnight and this morning the fan turned on full speed. The car was cold and off. It hasn’t happened again. I need to get fixed. Your video was on point. Thank you so much.

[@MasterTechLou]

Thank you as well!

[@walterqfranklin7465]

my car was doing the same thing, so was it a control module issue?

[@d_technician1731]

@@MasterTechLou p

[@WoodVideos]

​@walterqfranklin7465 did it end up being the SAM or control module?

[@patbaptiste9510]

That's what I want to specialize in - diagnostics, module troubleshooting and repair...after finding a faulty module. I watched one guy do it. He had some really specialized test equipment, like an electronic engine simulator in addition to a signal generator, oscilloscope, DVN and even a Microscope. Yeah...I love that kind of stuff.

[@Noir_truth]

Master tech lou, thank you sir for this video. I have the same MB scan tool. By just watching this video and how you showed how to view sensor data for the AC controller (indoor temp at 142 degree on mine), I was able to determine that the issue on my ac compressor and condenser fans not activating, was due to the ac controller switch panel inside the truck. I bought a use one off ebay, swapped them out, and "boom" everything works perfect. The next thing to tackle is to swap out the overhead sunroof switch panel, which also has a indoor temp sensor. Thank you sir

[@MasterTechLou]

Hey glad it helped some way!!!! I appreciate you reaching out!

[@MissionaryForMexico]

Another fix we have performed for fan run or no run. Installed a new circuit to control radiator cooling fan, thru the use of a manual switch in driver's dashboard. The customer has to turn on during operating of a/c, and city traffic. Saved the customer $$$. My favorite Mercedes-Benz, 126 chassis 300 SD turbo diesel, easy to diagnose and repair, all kinds of engines room, and built like tanks!

[@alistdetail5006]

Use SIA Electronics for Mercedes ECU. They are awesome. Based outside of Chicago. They will completely rebuild the ECU for $220. 3 year warranty. Fixed everything on our CLS.

[@TheMpamMpam]

Hi, thank you for all ur usefull videos. It means a lot to people that have to deal with dishonest dealerships and mechanics. I diagnosed a w204 c350 2012 with icarsoft and I get the following error message: P220101 The NOx sensor( cylinder BANK 1 ) has a malfuction. There is a general electrical fault. How is it possible to know which exact sensor (MB part number) I need to replace? Thank you

[@jamesoconnor3017]

Just catching up with some of your old videos mate, you worked hard on that one ! 👍

[@MasterTechLou]

Blood sweat and tears

[@jamesoconnor3017]

@@MasterTechLou . I really appreciate the time and effort you put in to these videos. The information is so valuable to me because Iv got a passion for Mercedes, I know they can be a pain in the arse but I still love them . Thanks again Man! 😎👍

[@MasterTechLou]

@@jamesoconnor3017 Man I appreciate that. I do. 🥰

[@gjagiello]

Ha that was a ride, I don't think I'm going this deep on my fan issue, but I enjoyed watching your work here. Nice guitar work on that track, btw.

[@user-zv9fc1yn4t]

Great diagnosis bro

[@eatont9999]

Can you re-authorize those 2007 and up ECUs with SDS or does it have to be a virgin unit? Another reason why swapping the EEPROM didn't work is because it looks like the donor ECU was not identical. I have found when doing work like this, if the ECU was made by a different subcontractor or even just a different year, the other chips on the module can be different and it doesn't know how to communicate with them. I always try to get the exact same part number and versioning.

[@stevethomson7528]

This was happening on a c class estate I recently bought I watched a few you tube videos and decided to start cheap and work up firstly I noticed the battery was brand new but looked very small and on looking closer found the battery had smaller CCA and lower ah than what was supposed to be on the car so luckily I had just bought a new battery for my s class which was obviously bigger CCA and ah I joined the positive and negative together in the boot and left overnight fitted the s class battery started the car with fingers crossed and no more fan on continuous from cold and no fan over run I have found over the years of Mercedes ownership if there is the slightest drop in battery voltage or performance it starts to play havoc with the electrical systems on the car hope this helps ps it won't solve everyone's problem but it solved mine

[@moefehail9933]

Thank for this information your share. i need to ask you something i have 2011 Viano W639 when i drive the AC is perfect when i stop in traffic the coiling is so low i changed the AC compressor (Denso) and new condenser as well what you think from your work experience the issue? thanks for your time.

[@MasterTechLou]

Thank you, sounds like weak compressor or low freon,. that is the only thing that comes to mind .

[@joeysanchez5926]

I use "Spare ECM" ... very good, nice, and professional.

[@purpletoo12]

That sounds scary like it will blow up....I would be running...LOL. Thanks for the help!

[@chloemae3171]

hi there love your videos been helpful but do you have one about the cooling fan Not working many thanks

[@Ltmiltonscouts]

I have a benz c230 and it's doing the same thing thanks for your video, I hope to touch base with you.

[@Ltmiltonscouts]

Plus I am from the Caribbean

[@MasterTechLou]

thank you so sorry on delay, I am not sure why I am not getting my notifications.

[@everetteramey5723]

This may be the same thing with the 08 c300. The motor looks the same. I replaced the coolsnt temp sensor; IAT senor and thermostat those cides were showing. The fans before i changed everything would stay on cimtinuously or not be on at all.. im going to try and tap the ECU and test it. I replaced my 07 300 CPU with a new one from the Flagdhip one auto; i had to flash it with that onboard diagnodtic its not just going to plug and play.. Thanks for the info..

[@iyokeobinna2363]

I just want to know where you put the second head of the multimeter when reading the fan signal line, thanks, i love your video

[@kylebennett9234]

Hey Lou, wondering what the company or guy you used to reprogram your ecu. I'm experiencing the same issue with my vehicle

[@kalantari27]

Hi Lou,i have same problem for 4 month.I changed 2 batteries ,mas and map sensor,water tem sensor,egr valve secondary air pump ac compressor,ac pressure switch none of these help after your video i found out there is no voltage in green wire to the fan and no voltage in fuse#47 but car start and run.I forgot to mention the car is 03 e320 and i changed fan too. I am not able to find your email and none of email and info that you have in you tube work is there any hope for help from you thanks Fred.

[@roziegonzalez1977]

I have the same issue with my 2007 Mercedes CLK Class 350. The AC fan won't work. Where did you send the computer module at NY exactly? How much they charged you?

[@keithwilliams9476]

Great video, gave me a sense of peace. would you mind sharing contact info for engine control module.

[@mahmoudhantouli5434]

Dear friend u have great video now i clone these ecm/tcm mercdes oem scanner

[@azharmiah9041]

Hi, thanks for the great video on this topic. I've been suffering through the same problem on my 2007 CLS550 for over a year now! Can you share the contact info of the ECM vendor you used in New York who fixed the ECM?

[@WoodVideos]

Hi friend, we're you able to get the contact info for the ecm repair? If you still have it or know where to go could you let me know please? I have the same issue currently and the fan goes on full blast right as soon as the car turns on till its off

[@JayGee6996]

If you ever need to remove components like this again, invest in a hot air blower (cheap Chinese versions are fine). It will allow you to heat up all of the soldered legs at the same time. Flux will also make the job much easier

[@michaelwyz2306]

I was looking for this. Thanks

[@MasterTechLou]

Michael Wyz hope it helps. Thanks!

[@rjalexander440]

@@MasterTechLou fan running full blast no key before that radio would no turn off no key . Sent out ecu today ugh

[@MasterTechLou]

@@rjalexander440 fingers crossed for you. hopefully you didnt set it towards michigan!

[@rjalexander440]

@@MasterTechLou Drive to place in illinois supposed to find out Tues if not I will need co name u used . ;)

[@ajazshaikh1178]

Hey Lou great video! I just had a ECU swapped for my son's 2001 Mercedes c240 car runs & drive however, Flagship One dis not write vehicle's VIN on ECU.....Would you please share the contact that guy Mike (in New York) coz I really don't want to mail ECU to Portland, Oregon to do this. Thanks! AJ

[@rizzotto139]

Awesome who’s the guy in ny Is he in the city and what was the charge from having the same issue with my 211 I’m gonna troubleshoot first to see if Ecu but I’m betting it is

[@hashemdergham1198]

He thx for this video i want to ask you You removed this iprom from the old one and put it in the new one ? And the car work @the new Or removed the iprom from the new and put in old and still @ the old one and thx you

[@MasterTechLou]

So with this module the eeprom was not enough, there is a second chip that needed swapped but I have no information on which one so I had to put them back. The eeprom did not have the vin information so the car would not start.

[@kaksken1999]

Hi I was reading the description and was wondering the eeprom module that you swapped and worked still was that the original to a used ecu or vise versa? Thanks

[@MasterTechLou]

both, i swapped from bad to good back to bad. there are 2 chips I could not find the location of the second one. :(

[@DimlyAwareHUmAn]

Hello! So what's the name of the shop in NY that was able to correctly perform the VIN swap? Am I to understand that swapping the chips was unnecessary given that the guy in NY transferred all the data? My 02 C230, battery died recently...when I recharged it, and reconnected, fan is running constantly with the engine off. Turn on engine, it goes off, so now sitting with battery disconnected. One guy says he fixed with a new battery. Hmmm...shot in the dark. Never had this problem before, but we get a lot of rain here recently moved to Oregon. Very hard on Mercedes.

[@MasterTechLou]

Sounds like you have a communication issue in the car. Engine module wont be the issue if theres no physical damage. Check engine bay fuse box for water and corrosion.

[@RoofboxCamping]

I am haveing the same issue with my C180 1.8 kompressor year 2005. It's saying - A camshaft position actuator circuit open bank 2. Any help would be great

[@MasterTechLou]

If you need help you can reach out to me at my site. Www.Cartechconnect.Com Thank you. Lou

[@jimlmX650i]

Ave the info for the guy in NY? My 2009 c300 is doing the same thing

[@wilsonk]

Nice sharing my friend

[@tonyurmate]

I was looking online and found a nice c class w203 mercades for sale and the description says that the cooling fan is always on. I priced a module for €231 which is 251 in dollars. Would the same module from another mercades w203 need to be programed or is it plug and play? Thanks in advance from Ireland 🇮🇪

[@MasterTechLou]

Hello Ireland! in my video I explained everything. They are vin specific modules.

[@mikeinnusa8786]

can you recomend somone to send out a mercedes engine control modules im in the same boat as you im in ny

[@walterqfranklin7465]

i just replaced my radiator a couple days ago. but once i turn the key on the fan went on full busted high speed. its killed my battery, so do you think its still the control module? the video was very helpful, but from what i seen and heard its looking and sounds like thats my problem. any feed back will be helpful.

[@MasterTechLou]

Walter Q Franklin all you need to do is follow the test steps. But its possible a wire broke to your fan which would do the same thing.

[@pistolp2633]

I have a Similar problem with my Mercedes Benz S550 year 2010 so at first my problem was my Belt I didn’t realize that my serpentine belt was no longer on the car is shredded. It’s sold to pieces so then I had to buy a whole new entire belt and install the belt. Then the car wouldn’t start due to low votes in the battery so I had to get a new battery now the car starts up and the fan doesn’t run all the time anymore he used to run for approximately 3 to 4 minutes after the car shut off and it sounds like it’s winding up or after I cut it on no once I cut it on the fan runs and then when I cut the car off it goes off in about a minute.. but it’s not as worse as it was before

[@cookingwithkratos]

Hey i need a new ecm. Can u please tell me where you got yours from. The website please. Thanks

[@MasterTechLou]

car-part.com

[@rahmatridloaminuddin5657]

Hi lou! I also experience this kind of issue in my 2006 E280. However, its kinda different as the ac is still breezingly cold, and the fan would turn off by itself while the outside temp is below 30 celcius or as if i was driving with low engine load (for example cruising at 60 mph), does it have to do with ecm too or is it normal? Thankyou for answering. Aldo from indonesia

[@MasterTechLou]

Sounds normal, have to check live data to see if ac is requesting the fan to be on. That will tell you for sure.

[@nikolaisteklov686]

Just wanna clear things. So if I swap chip with new one it should work? If not then change the ecu to another one? Have the same issue w221 s550 M273

[@MasterTechLou]

Theres two chips that need swapped however there is zero info I have found on which other chip has the immobilizer data

[@edwardrogers2897]

My gl 08 does this can you just unplug it until I get a new one soon before I trade it out not wanting to put money into great stuff also

[@MasterTechLou]

Thanks! If you unplug the fan your engine will overheat.

[@hassanmalik9072]

well done

[@MasterTechLou]

Thank you so much!

[@gariannebenson5745]

Im having the same problem with my 2019 c 300 mercedes benz. My fan comes on high speed and my ac is warm. Have you had any newer models with this problem? I'll have to invest in a diagnostic tool.

[@MasterTechLou]

Yes usually a bad pressure sensor sending wrong pressures so ac is cut off and fan is ran on high as a safety.

[@albert427]

Hey Lou, wow great video. I am also having the same issue regarding my fan on my C300. No codes at all as well. I was thinking it was the front sam because it happened shortly after some water intrusion. My AC is also having some issues so I wasn't sure if the AC can also trigger this fan condition. I wanted to know if there was a way to test the front sam and AC to see if it's the problem? Thank You for your video. You have me as a subscriber for sure.

[@MasterTechLou]

the front sam does not actuate the fan only the engine module on your model. basically with the scan tool you need to see if the engine module shows 0% activation, if the fan is on then the engine module is bad.

[@julior34758]

Hi Lou. I have a similar problem. Mine sometimes does it as well when the car is off.

[@albert427]

My issue was resolved by a changing the refrigerant high pressure sensor on the condenser. It was reading incorrectly too high.

[@berrybuinda6916]

@MasterTechLou Hello I have a jet like noise coming from the hood of my 09 Benz e350 4matic and the ECU was replaced but no change . Please I can use your advice

[@IanStory-cs9zo]

Appreciate the video! This has been an issue in my ‘07 e550 for several years now, and no one has been able to figure it out. Would you mind sharing the contact you used to reprogram the ECM? Much appreciated.

[@MasterTechLou]

sorry for the delayed reply, reach out to me on IG.

[@seanbrown6570]

WHATS UP..GREAT VID!! I'M IN NYC WITH THE SAME PROBLEM W219 2007 CLS550. CAN U DIRECT ME TO GUY IN NY? NOBODY CAN TELL ME WHATS WRONG WITH THIS FAN.🤷‍♂️

[@MasterTechLou]

so sorry not sure why I did not get this notification, with an 07 you have the same issue most likely.

[@Baytowntx83]

Im having the same issue on my glk350, how much would you charge to fix?

[@MasterTechLou]

Sorry I can not fix this for you.

[@brianb22]

Got a 2002 S430, the cooling fan will stay off until the car reaches a temp past 82 degrees celsius, and then it stays on. Got any leads?

[@MasterTechLou]

Honestly with a scanner and monitoring the ac pressures and temp sensor for the engine and checking to see who is asking for the fan activation, engine module or ac module, this sounds like a super easy diagnosis.

[@Worldfamous888]

Hey Lou, I have the same problem in this video, my fan comes on a second after I start the car and turns off when I turn off the car. My codes are P20CD

[@MasterTechLou]

sorry we have no way of looking up codes. We only get code diagnosis through the Mercedes scanner. there are a few reasons why fans will come on full speed. one is programming of the engine module, one is failed coolant temp sensor. failed fan, wiring, failed ME.

[@jameswaugh115]

My radiator cooling fan wont come on at all on my 01 c320..what should i do?

[@MasterTechLou]

Hello and thanks. The system functions the same as the car in the video. The video shows the process, thanks.

[@19lol19]

I sent my EIS to a guy in Michigan and he gave me the same excuse and tried to keep my money was it benztekpro?

[@MasterTechLou]

Peanut Man mercedesecm and ecuwarehouse same “company” im sure this “place “ goes by many names. In my experience they are to be avoided.

[@Baby1245]

OK. Good lesson

[@MasterTechLou]

Thank you John. Hope this helped. Lou

[@larrybland007]

The only thing missing on the desolder is flux. Other than that great work.

[@MasterTechLou]

Well thanks!

[@larrybland007]

@@MasterTechLou honestly your approach takes the "magic" out of car repair!

[@metalunique8262]

Would a Launch x431 be able to clone a ECM to swap?

[@MasterTechLou]

No it cannot

[@herveanderson6206]

Hi good evening. My ac reset fan won't turn off even when the car is not running how can I stop it please

[@MasterTechLou]

Remove the under dash panel on passenger side dash, unplug the fan. If you are talking about the blower motor for the heating and ac .

[@mahyarfaraji8221]

perfect i watched your video in Iran. i wanted sent you a message in your website but i couldn't. please help me how i can connect with you, Thank you.

[@MasterTechLou]

not sure why you couldnt connect on my website? email me direct at [e-mail]

[@mahyarfaraji8221]

​@@MasterTechLou because in Iran we have lots of filtering and i don't know why your website must be filter. how ever i open it with anti filter but i couldn't sent too you my comment.

[@pfoxhound]

Use of flux makes soldering enjoyable.

[@MasterTechLou]

I have never used it (obviously 😂😢) and this is why I personally dont do stuff like this . My first and last attempt.

[@stevethemechanic8099]

Was it Victor in New York fixed module?

[@MasterTechLou]

Mike

[@sprkamy]

My 2004 clk500 amg, have the same problem plus the interior don't work only the radio, no wipers,a.c,turn signal,horn and speedometer,gas level and temp level, won't do anything when start after couple trying

[@MasterTechLou]

So sorry to hear, check my video on 5 tips mercedes owners should know. You probably have water or corrosion in the front fuse box area or floor. If you need my help with diagnosis you can reach me at my site www.cartechconnect.com If not then its best to have a shop look at this. Thanks, Lou

[@r.weaver3769]

See I knew you were cool, a fellow guitarist. I don't have that exact issue, but on really hot days when starting the car up the fan sounded like that. I assumed it did that because the A/C was on trying to cool the interior quickly, it would be like 120 degrees inside the car when started. Since it's cooled off outside, I don't hear it loud like that anymore. Also, I kinda want a small scan tool to put in my "go" tool bag I carry for trips out of town, is that iCarsoft a decent "just in case" tool?

[@MasterTechLou]

🎸, icarsoft isnt bad. But there are a lot more options since I made this video. To me the A30m from xtool is such a good deal and super compact. But check out the ton of reviews I have done on my channel. See what else interests you.

[@r.weaver3769]

@@MasterTechLou Thanks Lou, I will look them over.

[@user-tc8ei6un3m]

Howzit bro I have a Mercedes Benz c180k 2009 model Day before yesterday it was raining n I hit a water patch the car switch off didn't what to start had to get a break down, yesterday left hold day it started but My come off conternesly no lights work no wipers work I don't what to check for😅

[@user-tc8ei6un3m]

Fan

[@MasterTechLou]

Water In fuse box most likely

[@victorvaldez3802]

Hey Lou nice video, my 06 R500 fans kick on full blast when key is in on position and nothing happens when I try to crank the engine. I have a scanner to try to find codes but I worry the battery will die before I look at everything. Would connecting jumper cables from another vehicle keep the battery charged as I scan? Can any further damage happen by letting the fans run for a prolonged period of time? Anything you suggest before scanning? Thank you in advance.

[@MasterTechLou]

Just unplug the fan. It wont hurt, I do it all the time.

[@victorvaldez3802]

@@MasterTechLou Ok thank you! Will any codes not be given due to the fan being unplugged while scanning?

[@MasterTechLou]

@@victorvaldez3802 is that really a concern considering the car wont start 😂, you will only have 1 code for the fan.

[@victorvaldez3802]

@@MasterTechLou I’m using the iCarsoft CR Pro diagnostic tool, I ran a smart scan and the ECM didn’t show up. I ran a manual scan and it says link error. I checked the ISM, ESP, TCM, and SRS and all both have the code “No CAN data was received from control module engine management” in the current state. Is the ECM fried or should I be looking for a loose connector somewhere?

[@MasterTechLou]

@@victorvaldez3802 sorry I dont diagnose via comments if you need help you can contact me through my site. Www.Cartechconnect.Com thanks

[@saturnn77]

Maybe the old one had a bad soder point. That can happen and quite often.

[@alrifainidal]

thanks for the video . what the signal ref the voltage should be ???? pleas help

[@MasterTechLou]

I show in the video the voltage for fan speed will be between 3v-12v

[@alrifainidal]

Thanks Mate . I am seeing 0 volt all the time on the signal wire also the same at the ECM , do u think ECM issue ??

[@MasterTechLou]

@@alrifainidal I dont like diagnosing over comments. if the fan is on and there is ) voltage on signal wire, the fan is the issue., but you have to confirm with a scanner and activating the fan to see if signal voltage occurs.

[@alrifainidal]

I am really sorry.. i dint mean to bug u. Thanks for ur help I have zero volt at the signal wire any way ... any way keep posting videos i like ur channel

[@MasterTechLou]

@@alrifainidal never a bother, if you need diagnosis help you can reach me on JustAnswer or my site www.cartechconnect.com

[@rohanboswell5408]

Just got a call guy says his 2006 r350 blower motor won't turn off ,my autel 908spro is broken

[@MasterTechLou]

90% of the time water is in the blower and resistor housing, its one piece/part from dealer. not sure if aftermarket sells individual but they wont work. Issue is common an a blower/resistor fixes it. dont take my word for it, do your diagnosis please. Lou

[@tylerhull6379]

Hey man, I’ve got a 2007 E350 that’s done the same thing for 3 YEARS now. Can you please drop the name of who in NY you sent the ECM off to??? Would really appreciate the help!!

[@MasterTechLou]

Email me I can give you his info.

[@tituswilliams4370]

What’s your email? I need the same done to my 05 e500 please

[@Baytowntx83]

@@MasterTechLou I also need your email, Thanks

[@Dnasty1]

That is crazy you had to do all that for a fan noise... seems like a poor design issue. Mine sounds loud like this on my 2010 e550 but only when I start the car with the ac on. If I start the car with it off the fan doesn't crank up like this. When the fan runs loud it won't shut off until I turn the car off. It is currently 100+ degrees out here so i'm wondering if the fan running like this is normal or if I have some issue? Also that is one clean engine bay.

[@MasterTechLou]

Fan will run with ac on, to cool ac, depends on pressures of ac system and outside temps. if its 100+ then I can assume its normal operation.

[@Dnasty1]

@@MasterTechLou thanks also was wondering if you still do online diagnosis. I tried your site but it was not working. Having a number of strange issues but no check engine light.

[@MasterTechLou]

@@Dnasty1 I closed my site. You can find me at justanswer.com Lou P

[@tootsieroll8696]

My car is doing this but only when it rains (not every time it rains). Do you have the guy's contact information who replaced the ECM?

[@MasterTechLou]

Then its not your issue and you have water killing communications in your cars modules

[@davidsyked9420]

Will a bad engine modular make the engine not start, but the fan run on high speed

[@MasterTechLou]

That happens due to no communication with the module. Either no power at the module, communication issues with the data bus, or bad engine module yes.

[@bevhoney-b2184]

I just watched your video & praying my car don't have the same problem.. it's a 2001 S430, however I have a coolant sensor light on in my dash and my fan will not cut off.. it doesn't Rev but my battery had died I bought a new one after installing the battery the fan came on without me starting the car. Do you think if I change the coolant fan sensor that this will take care of the problem? Please help thank you 🙂

[@MasterTechLou]

Hello, this model of yours does not Usually have the same problem, it’s usually a bad fan or fan control control module. It could be a coolant temp sensor but its best to have it diagnosed instead of trying parts.

[@stevethomson7528]

Try doing what some people call a hard reboot by joining the positive and negative together obviously don't touch the terminals leave overnight the refit and try it worth a try

[@danteokere5084]

Hi I live in Lagos Nigeria,my CLA 250 makes the same noise!

[@OMS3325]

Hello Lou, I’m facing issue with my fan i believe, it sound like the one in the begging of the video it goes higher and down. Do you have an email or any other social media account so i can send you a video of the issue. Many 🙏🏼 thanks

[@MasterTechLou]

Instagram

[@julior34758]

Can you just order one with the same vin #?

[@MasterTechLou]

No, since the module is vin coded its called TRP item, Theft Relevant Part, so the only way to get it fixed , well the way its supposed to be fixed, is the dealership is the one that has to install it to verify its installed in the right car so its not stolen. The dealer will not sell you any TRP part over the counter.

[@JollyBeef]

Can I get the guy from NY info - same prob here

[@clentmiller]

Same. . May I have the info as well

[@solidloud1922]

First thing todo is check the coolant level. If it’s below the sensor it will engage the fan constantly, mine was running I topped up a little coolant then it was fine. Suggest do this before taking apart wires and such

[@tonypagan7468]

Does the guy in NY does airbag module swap

[@MasterTechLou]

I do not have that answer sorry.

[@rogerzhang1228]

hi Lou, greating from australia. we had a w204 c300 came in with totally flat battery. we put a new battery in and knew why the battery had gone flat. the fan turned on randomly with the ingnition off and turned off short time later. on and off. i was thinking of the ecm but we also found there was large.amount. of water in the left side cabin floor. do u think the water trigger the issue or maybe there are seperate issues? thx a lot

[@MasterTechLou]

roger zhang fan comes on for 3 reasons. Engine module is activating it, fan Is shorted, there is no communication between the engine module and other modules . So figure out the water first. It will most likley be your issue.

[@demetrius316]

@@MasterTechLou Can you ask the guy in new york his information so i can send my ecm to him.

[@glasser2819]

with rain water issue check the Front-SAM circuit board for oxidation. The water get in at the roof seems (not sunroof, not windshield... SEEM when after 10years glue dries out)

[@smoke1va]

Solder wick and solder sucker would of made this job way easier. But great 👍 info

[@MasterTechLou]

Thanks, I dont do this sort of thing, sure it’s obvious by my terrible soldering skills on circuit boards, 😂.

[@smoke1va]

No worries man I’m not grilling you. Just trying to help out. I do it daily for a living. And used to swap chips out for Nissans and Honda Ecus.

[@MasterTechLou]

@@smoke1va didnt take it that way at all ❤️

[@bobbywater182]

my 2011 c300 blinkers or wipers wont work and the electric fan stays on when the car is started. help please.

[@MasterTechLou]

Sorry not sure why I just sen this now. You have communication issues in the car, I can help if you find me at www.cartechconnect.com thanks, Lou

[@adonburke8212]

I have the same problem I need help

[@MasterTechLou]

@@adonburke8212 this video shows what nees to be done, I am not sure what else you need help with,. if you do you can reach me at www.cartechconnect.com thank you Lou

[@autogadgetsnyc]

I think I'm the guy in NY you sent to lol

[@MasterTechLou]

This guys name was Mike. But if you do this kind of work and are successful then maybe we can work together because I get a flood of emails askin who and where to send ecm’s to.

[@arthurharrell6963]

I have that exact same problem.

[@syxxwilliams]

did u send it to flagship in nassus county i live in suffolk i know them people thats how i learned how to clone

[@MasterTechLou]

no, michigan, ecu warehouse. scammers.

[@syxxwilliams]

@@MasterTechLou are they located in li so why do the fan stay running even after i cloned the ecu its still doing the samething

[@MasterTechLou]

@@syxxwilliams I cant answer that. The video I made shows and explained why the fan ran and how to check to see if the ecm is actually activated the fan or not.

[@wandaramos5250]

I need some advice on the Mercedes’ I have can you please help me

[@MasterTechLou]

What kind of advice?

[@wandaramos5250]

I have a Mercedes’ benzc300 and it’s giving me electrical problems sometimes the headlights stay on and the ac and the radio goes on and off I have taken to different places but no body can tell what’s wrong with it

[@MasterTechLou]

@@wandaramos5250 take it to the dealer. Most likely has water or corrosion in the front fuse box. Biggest problem with owning these cars is tryin to avoid the dealer and finding someone competent enough to work on them.

[@wandaramos5250]

@@MasterTechLou thank you so much for answering my question

[@davidestate]

Happened to my car = 2016 C-Class.. change complete engine module.

[@MasterTechLou]

David Estate sorry to hear :( such a crappy way to have to spend that money.

[@fuffoon]

1900 watt fan?

[@Ren200Z_MotoringLife]

blows my mind why they put control modules on engine or engine bay in all the heat

[@MasterTechLou]

MiG Ren E' good question. Next question 😂

[@aymenmohamed1134]

👍🏻👍🏻👍🏻🌷

[@MuhammadArshad-pw3km]

Hello

[@robertodelgado8382]

So to understand . I am no mechanic . The problem is on the computer ? Recently my computer was changed for a “new “ and this problem happened . So if it is on the computer I believe is on my guarantee . That is why my question

[@MasterTechLou]

Correct, the engine control module is faulty

[@stevechu7465]

IMHO if the ECU doesnt send a signal to the Fan to run it fast , its not the ECU, its the Fan control module/motor thats faulty , only if the ECU is erroneously requesting the Fan to turn on even when the air is not on and its not hot because you just started the car , then it cant be the ECU it has to get erroneous request fromt the ECU for it to be the ECU problem , other wise your throwing your money away on a new ECU when its the Fan control module ie motor on the Fan , is my laymans answer based on watching a bunch of too fast fan videos however I do have an error code ECM - Engine Control Module(ME) P203E-004 No CAN Message From Instrument Cluster Or Message Faulty. Communication Fault / See Also CAN Status In Freeze Frame data(P0600) could this error message indicate a ECM fault causing the fan to run fast at start based on your diagnosis video ???

[@mgabrielle2343]

why on earth Mercedes did not use a fan relay as an ultimate safety switch after engine is powered down , this relay would ensure battery does not get drained unnecessarily, with my knowledge of electronics i can tell you that integrated control fans have power transistors that can fail and continue to run the fan as it has permanent battery feed, so a relay would have cut all power to it unless the ignition was on when the fan would come on even if not needed, in an emergency you would still be able to use your car, why i am here is because a friends 230 Merc has fan coming on at Full Speed almost so frightening standing near it as blades could fly off it and hurt someone, I diagnosed issues with its engine control module that is sending permanent 12v into the control wire the green wire I believe is earth, brown and green wire is where the signal appears, the fan was tested ok, so if you do not connect control terminals and only apply ground and power to fan's big terminals it does not run, so fault is in control unit which should send pulse width modulation control signal to run fan and at appropriate speed depending on how hot the engine is and how much cooling it requires.

[@reys_live7243]

Why swap vin info needed ??

[@MasterTechLou]

Antitheft. Vins have to match in certain modules

[@reys_live7243]

@@MasterTechLou on my car the fan come one high when I turn the key 🔑 and turns off when the key is off , stays high idle fan , I switched the relay fuse and still does the same thing , I put in new temp sensor near the thermostat and one under the coolant tub 🛀, still some fan idle idk why

[@MasterTechLou]

@@reys_live7243 this video shows exactly how it needs diagnosed. :)

[@reys_live7243]

@@MasterTechLou it only runs when I turn the key on and it turns off when the key is off is a good thing it don’t burn my battery 2004 Mercedes Benz clk 500

[@curlymyhero]

MB modules r the worst since MB is very paranoid about " safety" and car theft. Hence they it make nearly impossible to do what Mike tried to do-- and failed. EIS modules r the same way and cars often have to b towed to the dealer

[@iamher6422]

I wonder if this is what’s preventing my 2006 E350’s fuel pump from turning on..🤔 Unfortunately I have the PZEV fuel system from California. I cannot justify paying that ridiculous $2600 price for a new fuel tank. I replaced the sending unit with a new one and still nothing. I spray starting fluid into the throttle body and she fires up nicely. I’m wondering if my ECM could be the culprit. If that’s not my issue, then the E350 is getting scrapped. Shame, she’s a beautiful car and has served me extremely well. I hate the thought of having to part with her… I’ve heard of some hacks being performed like an external pump or even cutting a hole up top under my rear seat and installing a new pump through there. 🤦🏼‍♀️🤷🏼‍♀️😵‍💫🙏🏼

[@MasterTechLou]

You need a new engine module. In 06-07 they wont turn on the fuel pump relay.

[@MuhammadArshad-pw3km]

Sir

[@benhajdu4040]

When you read the ecm codes... You missed 10 codes. You also didnt check right side sam.

[@amg_qtr2252]

حد فهم